Well, neither are you the one who is to decide what people should do with their buying power.

In fact if someone comes here and searches for a font, he does that not because he is a thief and shell be punished, but because he considers your font not being worth that price you claim.

Your product is not worth to him what you desire him to pay you. He therefore would one way or the other not buy your font.

What does that mean for you? You are not loosing anything from sales, because people who are searching for free downloads would not buy in any other case from you, except you would alter the price.
In fact you should recognize that you are gaining from people who use your font in an aesthetic way for their clients. Imagine your font is used and becomes well-known, this will increase the demand in people who want this font. Your work will get desirable for more people than it was before it was getting shared, and among these people there will be new ones who will buy from you because your work is worth your claimed price to them.

Take as an example Helvetica Neue. It is probably the most common font.
Do you really think it bothers Adobe if it is shared? Quite the contrary.

I tell you honestly: I have never used a font for any commercial project whatsoever. I simply love beautiful typefaces and collect them for my own pleasure. It's fascinating for me, and I admit if I would use them for a client the case would be clear for me: The client has to pay the expenses for third party instruments. But that is the fault of some so called designers and their poorly designed contracts.

In any case, please do consider the points I brought up which might seem very confusing for you right now and make great fonts for you and everyone who considers the price you demand as being correct.

LaTeXian